How can I use vertical camera in navigator.mediaDevices.getUserMedia + android phone?

I’m trying to open cameras in portrait mode (vertically). It works fine in my development PCs (two desktops and a notebook) + chrome browser, but I’m failing to do the same in a debug android phone + chrome mobile.

I’m writing a vuejs2.x app, but this camera part is pure html+js:

const testAspectRatio = this.isLandscape() ? 1920/1080 : 1080/1920
const cameraConstraints = {
                    video: {
                        deviceId: deviceId,
                        aspectRatio: testAspectRatio,
                        // width: { ideal: this.isLandscape() ? 1920 : 1080 },//this.height,
                        // height: { ideal: this.isLandscape() ? 1080 : 1920 } //this.width
                    }
                }

navigator.mediaDevices.getUserMedia(this.cameraConstraints).then(stream => {
//...

What am I doing? In desktop browser both approaches seem to work fine: I can either ask for a desired aspect ratio or try to suggest ideal width and height. In mobile I can see in debug logs that I asked for vertical stream, like 1080 width X 1920 height, and the browser’s api gives me a regular landscape (horizontal) stream.

How can I fix this behavior? What am I doing wrong?

Test phone is a poco x5 pro. Will try more phones (and emulated android) today =)